Armature for dynamo electric machines



(No Model.) 2 Sheets-Sheet 1. L. DAJET.

ARMATURE FOR DYNAMO ELECTRIC MACHINES.

Patented May 1,1883.

I. FETERSrMwLiMrW, WM 0. C.

(No Model.) 2 Sheets-Sheet 2. L. DAPT.

ARMATURE FOR DYNAMO ELECTRIC MACHINES.

No. 276,568. Patented May 1,1883.

. www

W u [Z4 Qou' UNITED STATES PATENT OFFICE.

LEO DAFT, OF GREENVILLE, NEW JERSEY.

ARMATURE FOR DYNAMO-ELECTRIC MACHINES.

SPECIFICATION forming part of Letters Patent No. 276,568, dated May 1, 1883.

(No model.)

To all whom it may concern: I

Be it known that I, LEO DAFT, of Greenville, New Jersey, have invented a new and useful Improvement in Armatures for Magneto or Dynamo Machines, of which the following is a full, true, and exact description, reference being had to the accompanying drawings.

My invention relates to a ne and simple construction of armature, by which the same may be readily and cheaply made; and it also relates to a method of concentrating the magnetic force of the field-magnet immediately upon the wires from which the electricity is to be derived.

'My invention is applicable in many forms of winding, and I do not limit myself to any specific manner of winding.

My invention will be readily understood from the accompanying drawings, of which Figure 1 is an elevation, partly in section, of a magnet and armature illustrating my improvement. and different methods of winding; and Fig. 2 is a view at right angles to Fig. .l, partly in section and partly in perspective.

In the form of armature shown, A. represents an iron ring, having cast or otherwise fixed upon it the dividing iron sectors F. \Vithin these sectors are placed the dividing angular projections G, preferably made of some non-magnetic material, such as that known as vulcanized fiber. The metallic portion of my armature is circumferentially grooved by the grooves J, as shown, which both prevent lateral currents and also serve to cool the armature. The ring is supported upon a double spider-frame, B, revolving about the journal 0 and provided with arms L, which are attached to the metallic portion of the ring, preferably on the flattened sectors K, as shown. The ring revolves between the poles of a fieldmagnet, T, of any suitable construction. In winding my ring I interpose circumfcrentiaily, and in some cases laterally, plates of iron between the coils of the ring.

H represents generally coils of wire properly wound between the dividing-sectors F G, as shown. In the form of winding shown in the upper part of Fig. l a dividing-plate, D, is first placedin the groove extending radially in the direction in which thecoil is to be wound. A layer of wire is then wound next to the iron of the armature. Plates E are then interposed between this coil and the next. Other plates are then interposed, so as to divide each coil from the one next above it by such plate. These dividing-platesmay beplaced both within and without the iron ringA; but I find thatit is preferable to place them only upon the exterior of the armature. I preferably employ a dividing-plate between each successive coil, as shown atE; but I find that a beneficial result may be obtained from the use of one or more of such plates, as shown at E on the right of Fig. 1. By interposing these plates between the successive coils I obtain a concentration of magnetic force in those plates, which produces a largely increased efficiency in the machine; but the essential i'eatnre or its utility is the concentration of the magnetic field produced by the field-magnet in immediate proximity and relation to the wires of the armature. It is plain that this method of interposing plates of magnetic material between the coils is applicable to other forms of armature besides that shown, and that the beneficial effects of the interposed magnetic material can also be experienced when the armature is part of a motor as well as when it is used in a dyname-machine.

YVhat I claim as my invention, and desire to secure by Letters Patent, is

1. An armature for dynamo-machines and motors, wound with a series ot'superposed coils, between the layers of which thin flat plates of magnetic material are circumferentially placed, in combination with an additional or field magnet for the purpose of pro ducing a magnetic field by said field-magnet and concentrating said induced magnetism in immediate proximity to the wire of the armature, substantially as described.

2. The combination of a circular or ring armature provided with a series of superposed wire coils and plates of magnetic material interposed between them, with an independent field-magnet for inducing a magnetic field in said armature, substantially as described.

3. An armature in which the coils of wire are separated circumfcrentially and radially by thin plates of magnetic material laid between the coils, substantially as described.

LEO DAFT.

Witnesses ANTHONY Gnnr, Jr, GEO. H. EVANs. 

